2440665641 has 2 divisors, whose sum is σ = 2440665642. Its totient is φ = 2440665640.

The previous prime is 2440665611. The next prime is 2440665701. The reversal of 2440665641 is 1465660442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2275671616 + 164994025 = 47704^2 + 12845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2440665641 - 2²⁶ = 2373556777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2440665595 and 2440665604.

It is not a weakly prime, because it can be changed into another prime (2440665611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1220332820 + 1220332821.

It is an arithmetic number, because the mean of its divisors is an integer number (1220332821).

Almost surely, 2^2440665641 is an apocalyptic number.

It is an amenable number.

2440665641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2440665641 is an equidigital number, since it uses as much as digits as its factorization.

2440665641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 2440665641 is about 49403.0934355330. The cubic root of 2440665641 is about 1346.3855101688.

The spelling of 2440665641 in words is "two billion, four hundred forty million, six hundred sixty-five thousand, six hundred forty-one".